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Kinematics of Parsec-scale Jets of Gamma-Ray Blazars at 43 GHz within the VLBA-BU-BLAZAR Program Open
We analyze the parsec-scale jet kinematics from 2007 June to 2013 January of a sample of γ -ray bright blazars monitored roughly monthly with the Very Long Baseline Array at 43 GHz. In a total of 1929 images, we measure apparent speeds of …
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Projection-type see-through holographic three-dimensional display Open
Owing to the limited spatio-temporal resolution of display devices, dynamic holographic three-dimensional displays suffer from a critical trade-off between the display size and the visual angle. Here we show a projection-type holographic t…
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Continuous angle-tunable birefringence with freeform metasurfaces for arbitrary polarization conversion Open
Freeform metasurfaces couple the angle and polarization degrees of freedom, enabling new types of elliptical wave plates.
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Anisotropic characteristic of artificial light at night – Systematic investigation with VIIRS DNB multi-temporal observations Open
The released VIIRS DNB nightly images, also known as VIIRS DNB daily nighttime images, provide rich information for time series analysis of global socioeconomic dynamics. Anisotropic characteristic is a possible factor that influences the …
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Broadband antireflection film with moth-eye-like structure for flexible display applications Open
Sunlight readability is a critical requirement for display devices, especially for mobile displays. Anti-reflection (AR) films can greatly improve sunlight readability by reducing the surface reflection. In this work, we demonstrate a broa…
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Off-axis short GRBs from structured jets as counterparts to GW events Open
Binary neutron star mergers are considered to be the most favourable sources that produce electromagnetic (EM) signals associated with gravitational waves (GWs). These mergers are the likely progenitors of short duration gamma-ray bursts (…
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Ambient contrast ratio of LCDs and OLED displays Open
We systematically analyze the ambient contrast ratio (ACR) of liquid crystal displays (LCDs) and organic light-emitting diode (OLED) displays for smartphones, TVs, and public displays. The influencing factors such as display brightness, am…
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High‐Color‐Purity Subtractive Color Filters with a Wide Viewing Angle Based on Plasmonic Perfect Absorbers Open
High angular tolerant subtractive structural color filters with improved color purity, employing a plasmonic perfect absorption property, are demonstrated. The proposed devices exhibit angle-insensitive characteristics up to ±80° while mai…
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Interactive floating full-parallax digital three-dimensional light-field display based on wavefront recomposing Open
Advanced three-dimensional (3D) imaging techniques can acquire high-resolution 3D biomedical and biological data, but available digital display methods show this data in restricted two dimensions. 3D light-field displays optically reconstr…
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Polarimetric imaging mode of VLT/SPHERE/IRDIS Open
Context. Circumstellar disks and self-luminous giant exoplanets or companion brown dwarfs can be characterized through direct-imaging polarimetry at near-infrared wavelengths. SPHERE/IRDIS at the Very Large Telescope has the capabilities t…
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360-degree tabletop electronic holographic display Open
We demonstrate a tabletop holographic display system for simultaneously serving continuous parallax 3.2-inch 360-degree three-dimensional holographic image content to multiple observers at a 45-degree oblique viewing circumference. To achi…
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Afterglow light curves from misaligned structured jets Open
GRB 170817A/GW 170817 is the first gamma-ray burst (GRB) clearly viewed far from the GRB jet’s symmetry axis. Its afterglow was densely monitored over a wide range of frequencies and times. It has been modelled extensively, primarily numer…
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Polarization angle swings in blazars: The case of 3C 279 Open
Context. Over the past few years, on several occasions, large, continuous rotations of the electric vector position angle (EVPA) of linearly polarized optical emission from blazars have been reported. These events are often coincident with…
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Structure of gamma-ray burst jets: intrinsic versus apparent properties Open
With this paper we introduce the concept of apparent structure of a gamma-ray burst (GRB) jet, as opposed to its intrinsic structure. The latter is customarily defined specifying the functions ε(θ) (the energy emitted per jet unit sol…
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The Comptonization of accretion disc X-ray emission: consequences for X-ray reflection and the geometry of AGN coronae Open
We consider the Comptonisation of the photons that make up the\nrelativistically blurred reflection that is commonly detected from the\naccretion discs of AGN by the coronae of energetic particles believed to give\nrise to the powerful X-r…
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Can an off-axis gamma-ray burst jet in GW170817 explain all the electromagnetic counterparts? Open
Gravitational waves from a merger of two neutron stars (NSs) were discovered for the first time in GW170817, together with diverse electromagnetic (EM) counterparts. To make constraints on a relativistic jet from the NS merger, we calculat…
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Observational signatures of disc and jet misalignment in images of accreting black holes Open
Black hole (BH) accretion is one of nature’s most efficient energy extraction processes. When gas falls in, a significant fraction of its gravitational binding energy is either converted into radiation or flows outwards in the form of BH-d…
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Table screen 360-degree holographic display using circular viewing-zone scanning Open
A table screen 360-degree holographic display is proposed, with an increased screen size, having an expanded viewing zone over all horizontal directions around the table screen. It consists of a microelectromechanical systems spatial light…
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Optimized blue-phase liquid crystal for field-sequential-color displays Open
We report an optimized blue phase liquid crystal (BPLC) mixture JC-BP08 for field-sequential-color (FSC) display applications. JC-BP08 exhibits several attractive features: 1) its fast average gray-to-gray response time enables FSC display…
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Food Volume Estimation Based on Deep Learning View Synthesis from a Single Depth Map Open
An objective dietary assessment system can help users to understand their dietary behavior and enable targeted interventions to address underlying health problems. To accurately quantify dietary intake, measurement of the portion size or f…
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Time-multiplexed light field display with 120-degree wide viewing angle Open
The light field display can provide vivid and natural 3D performance, which can find many applications, such as relics research and exhibition. However, current light field displays are constrained by the viewing angle, which cannot meet t…
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Pixel-by-pixel local dimming for high-dynamic-range liquid crystal displays Open
We propose a high dynamic range (HDR) liquid crystal display (LCD) with pixel-level local dimming. The device structure consists of a pixelated LCD dimming panel to control the backlight intensity entering the master LCD panel. According t…
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Large viewing angle holographic 3D display system based on maximum diffraction modulation Open
An ideal holographic 3D display should have the characteristics of large viewing angle, full color, and low speckle noise. However, the viewing angle of the holographic 3D display is usually limited by existing strategies, which vastly hin…
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The (un)suitability of modern liquid crystal displays (LCDs) for vision research Open
Psychophysical and physiological studies of vision have traditionally used cathode ray tube (CRT) monitors to present stimuli. These monitors are no longer easily available, and liquid crystal display (LCD) technology is continually improv…
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Deep learning based image reconstruction algorithm for limited-angle translational computed tomography Open
As a low-end computed tomography (CT) system, translational CT (TCT) is in urgent demand in developing countries. Under some circumstances, in order to reduce the scan time, decrease the X-ray radiation or scan long objects, furthermore, t…
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Spectral puzzle of the off-axis gamma-ray burst in GW170817 Open
Gravitational waves from a merger of two neutron stars (NSs) were discovered for the first time in GW170817, together with diverse electromagnetic counterparts, providing a direct clue to the origin of short gamma-ray bursts (sGRBs). The a…
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MULTIFREQUENCY PHOTO-POLARIMETRIC WEBT OBSERVATION CAMPAIGN ON THE BLAZAR S5 0716+714: SOURCE MICROVARIABILITY AND SEARCH FOR CHARACTERISTIC TIMESCALES* Open
Here we report on the results of the Whole Earth Blazar Telescope photo-polarimetric campaign targeting the blazar S5 0716+71, organized in 2014 March to monitor the source simultaneously in BVRI and near-IR filters. The campaign resulted …
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Discovery of X-Ray Polarization from the Black Hole Transient Swift J1727.8−1613 Open
We report the first detection of the X-ray polarization of the bright transient Swift J1727.8−1613 with the Imaging X-ray Polarimetry Explorer. The observation was performed at the beginning of the 2023 discovery outburst, when the source …
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Asymmetries around the visual field: From retina to cortex to behavior Open
Visual performance varies around the visual field. It is best near the fovea compared to the periphery, and at iso-eccentric locations it is best on the horizontal, intermediate on the lower, and poorest on the upper meridian. The fovea-to…
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Holographic Waveguide Display With Large Field of View and High Light Efficiency Based on Polarized Volume Holographic Grating Open
We propose a polarization multiplexing structure based on multilayer reflective polarized volume holographic gratings(PVGs) to improve the field of view and brightness of the augmented reality waveguide display. The multilayer structure fo…