Results 1 to 10 of about 2,575,319 (401)

Identification of Bright Lenses from the Astrometric Observations of Gravitational Microlensing Events [PDF]

CNU-A&SS-05/99, 1999
When a source star is gravitationally microlensed by a dark lens, the centroid of the source star image is displaced relative to the position of the unlensed source star with an elliptical trajectory. Recently, routine astrometric follow-up measurements of these source star image centroid shifts by using high precision interferometers are proposed to ...
Han, Cheongho, Jeong, Youngjin
arxiv   +3 more sources

Finite-source and finite-lens effects in astrometric microlensing [PDF]

MNRAS, 407 (2010) 1597-1608, 2010
The aim of this paper is to study the astrometric trajectory of microlensing events with an extended lens and/or source. We consider not only a dark lens but also a luminous lens as well. We find that the discontinuous finite-lens trajectories given by Takahashi (2003) will become continuous in the finite-source regime.
A. Riffeser, Agol, Albrow, Alcock, Alcock, Alcock, Alcock, Allen, Batista, Belokurov, Boden, C. H. Lee, Cassan, Delplancke, Dominik, Fouque, Gould, Gould, Gould, Goullioud, Hog, Hosokawa, Jeong, Jiang, Lee, Lindegren, Mao, Miyamoto, Quirrenbach, R. Bender, S. Seitz, Takahashi, Tisserand, Walker, Wyrzykowski, Yee, Yoo   +36 more
arxiv   +4 more sources

Cylindrical Superlens by a Coordinate Transformation [PDF]

Phys. Rev. B 78, 125113 (2008), 2008
Cylinder-shaped perfect lens deduced from the coordinate transformation method is proposed. The previously reported perfect slab lens is noticed to be a limiting form of the cylindrical lens when the inner radius approaches infinity with respect to the lens thickness.
J. B. Pendry, Min Qiu, Min Yan, Wei Yan
arxiv   +3 more sources

The cosmological lens equation and the equivalent single-plane gravitational lens [PDF]

, 1997
The gravitational lens equation resulting from a single (non-linear) mass concentration (the main lens) plus inhomogeneities of the large-scale structure is shown to be strictly equivalent to the single-plane gravitational lens equation without the cosmological perturbations.
Schneider, Peter
arxiv   +5 more sources

Spacetime perspective of Schwarzschild lensing [PDF]

Phys.Rev. D61 (2000) 064021, 2000
We propose a definition of an exact lens equation without reference to a background spacetime, and construct the exact lens equation explicitly in the case of Schwarzschild spacetime. For the Schwarzschild case, we give exact expressions for the angular-diameter distance to the sources as well as for the magnification factor and time of arrival of the ...
E. Schrödinger, Ezra T. Newman, J. Ehlers, K. P. Rauch, P. Schneider, R. Blanford, S. Frittelli, Simonetta Frittelli, T. P. Kling, Thomas P. Kling   +9 more
arxiv   +3 more sources

GDPR Compliant Blockchains–A Systematic Literature Review

IEEE Access, 2021
Although blockchain-based digital services promise trust, accountability, and transparency, multiple paradoxes between blockchains and GDPR have been highlighted in the recent literature.
Akm Bahalul Haque, A. K. M. Najmul Islam, Sami Hyrynsalmi, Bilal Naqvi, Kari Smolander   +4 more
doaj   +1 more source

A machine learning approach to Bayesian parameter estimation

npj Quantum Information, 2021
Bayesian estimation is a powerful theoretical paradigm for the operation of the approach to parameter estimation. However, the Bayesian method for statistical inference generally suffers from demanding calibration requirements that have so far restricted
Samuel Nolan, Augusto Smerzi, Luca Pezzè   +2 more
doaj   +1 more source

Blockchain Enabled Digital Transformation: A Systematic Literature Review

IEEE Access, 2022
Digital transformation is an inevitable trend that impacts all industries, and blockchain is one technology that drives it along with other emerging technologies.
Anastasiia Gurzhii, A. K. M. Najmul Islam, A. K. M. Bahalul Haque, Venkata Marella   +3 more
doaj   +1 more source

3D molecular phenotyping of cleared human brain tissues with light-sheet fluorescence microscopy

Communications Biology, 2022
An optimized clearing approach, named SHORT, applied to thick sections of human cortical tissue allows reconstruction of large portions of the tissues using light-sheet fluorescence microscopy, by performing multicolor immunostaining and multirounds.
Luca Pesce, Marina Scardigli, Vladislav Gavryusev, Annunziatina Laurino, Giacomo Mazzamuto, Niamh Brady, Giuseppe Sancataldo, Ludovico Silvestri, Christophe Destrieux, Patrick R. Hof, Irene Costantini, Francesco S. Pavone   +11 more
doaj   +1 more source

Towards a GDPR-Compliant Blockchain-Based COVID Vaccination Passport

Applied Sciences, 2021
The COVID-19 pandemic has shaken the world and limited work/personal life activities. Besides the loss of human lives and agony faced by humankind, the pandemic has badly hit different sectors economically, including the travel industry.
AKM Bahalul Haque, Bilal Naqvi, A. K. M. Najmul Islam, Sami Hyrynsalmi   +3 more
doaj   +1 more source