Korkunç İstanbul

Yeni Türk'te tefrika edilen Korkunç İstanbul adlı romanTefrikada yazarın adı belirtilmemiştir.Tefrika yarım kalmıştır. Arşivdeki eksikler nedeniyle tefrikanın tamamlanıp tamamlanmadığı bilinmemektedir

Search for eccentric black hole coalescences during the third observing run of LIGO and Virgo

Despite the growing number of confident binary black hole coalescences observed through gravitational waves so far, the astrophysical origin of these binaries remains uncertain. Orbital eccentricity is one of the clearest tracers of binary formation channels. Identifying binary eccentricity, however, remains challenging due to the limited availability of gravitational waveforms that include effects of eccentricity. Here, we present observational results for a waveform-independent search sensitive to eccentric black hole coalescences, covering the third observing run (O3) of the LIGO and Virgo detectors. We identified no new high-significance candidates beyond those that were already identified with searches focusing on quasi-circular binaries. We determine the sensitivity of our search to high-mass (total mass M>70 M⊙) binaries covering eccentricities up to 0.3 at 15 Hz orbital frequency, and use this to compare model predictions to search results. Assuming all detections are indeed quasi-circular, for our fiducial population model, we place an upper limit for the merger rate density of high-mass binaries with eccentricities 0<e≤0.3 at 0.33 Gpc−3 yr−1 at 90\% confidence level

Ultralight vector dark matter search using data from the KAGRA O3GK run

Among the various candidates for dark matter (DM), ultralight vector DM can be probed by laser interferometric gravitational wave detectors through the measurement of oscillating length changes in the arm cavities. In this context, KAGRA has a unique feature due to differing compositions of its mirrors, enhancing the signal of vector DM in the length change in the auxiliary channels. Here we present the result of a search for U(1)B−L gauge boson DM using the KAGRA data from auxiliary length channels during the first joint observation run together with GEO600. By applying our search pipeline, which takes into account the stochastic nature of ultralight DM, upper bounds on the coupling strength between the U(1)B−L gauge boson and ordinary matter are obtained for a range of DM masses. While our constraints are less stringent than those derived from previous experiments, this study demonstrates the applicability of our method to the lower-mass vector DM search, which is made difficult in this measurement by the short observation time compared to the auto-correlation time scale of DM

Novel DMD-based Lidar and Display Systems

Digital Micromirror Devices (DMD) have been used in prescribed optical architectures for decades with very little deviation. These prescribed architectures most commonly include F-number-limited illumination to project a binary spatially-modulated DMD to a distant plane. Rather, this dissertation investigates four optical architectures, two for lidar applications and two for display applications, that deviate from the prescribed design forms. First, an imaging lidar system is presented that reverses the typical architecture: an illuminated field is imaged onto a DMD for spatial scanning and coupled to a detector. Second, DMD-based programmable blazed grating beam steering is multiplexed with spatial modulation for Angular Spatial Light Modulation (ASLM). The ASLM technique is employed as a holographic beam steering mechanism for a lidar system for increased angular resolution and field of view. Third, the ASLM technique is implemented into a multi-display system to increase the effective output pixel count of the DMD. Fourth, a cascaded DMD expansion design is demonstrated for a 1440-perspective gigapixel display. The four presented architectures demonstrate enormous untapped potential for DMD-based optical systems, despite the last 30+ years of DMD system development.Release after 09/06/202

Angular and spatial light modulation by single digital micromirror device for display applications

A single Digital Micromirror Device with a single illumination source projects multiple, independent patterns into corresponding directions across a nearly-doubled angular extent by time multiplexing and by nanosecond illumination pulse synchronization for a binary patterned programmable blazed grating. The resulting "Angular Spatial Light Modulator" (ASLM) system nearly-doubles the etendue of a DMD-type SLM and creates a multiplication factor for the output pixel count and effective pixel density. We demonstrate an extended FOV display, a light-field projector, and a multi-view display which can be implemented into AR/VR systems. We present an implementation update using the DLP7000 DMD, increasing output pixel count by and effective pixel density orders-of-magnitude beyond traditional SLM systems while achieving an extended field-of-view and/or eye-box size due to the increased etendue.Immediate accessThis item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at [email protected]

Fast laser beam steering into multiple diffraction orders with a single digital micromirror device for time-of-flight lidar

The sampling rate and angular resolution of diffraction-based beam steering employing a digital micromirror device (DMD) can be simultaneously enhanced by at least an order of magnitude by synchronizing multiple nanosecond laser sources and pulses during each DMD actuation. A time-of-flight single-chip DMD lidar with three sources measures a range at a 3.34 kHz sampling rate and a 3.4 degrees angular resolution across a 48 degrees field of view. Employing multiple diffraction orders of the DMD improves the sampling rate at least by a factor of 2 and up to the number of diffraction orders supported by the DMD. An improved sampling rate of 6.68 kHz with a 9.6 degrees angular resolution is experimentally demonstrated by illuminating micromirrors multiple times within a single transition period of the micromirrors. (C)2020 Optical Society of America.12 month embargo; published 20 July 2020This item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at [email protected]

Gigapixel and 1440-perspective extended-angle display by megapixel MEMS-SLM

Orders-of-magnitude increases are desired in the pixel count and density of spatial light modulators (SLMs) for next-gen displays. We present in-plane and simultaneous angular-spatial light modulation by a micro electro mechanical system (MEMS)-based SLM, a digital micromirror device (DMD), to generate gigapixel output by time and angular multiplexing. Pulsed illumination synchronized to the micromirror actuation achieves pixel-implemented and diffraction-based angular modulation, and source multiplexing increases angular selectivity. We demonstrate 1440-perspective image output across a 43.9∘×1.8∘ FOV, 8-bit multi-perspective videos at 30 FPS, and multi-focal-plane image generation. We discuss scalability to terapixels and implications for near-to-eye displays.12 month embargo; published 04 September 2020This item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at [email protected]

Angular and spatial light modulation by single digital micromirror device for beam and pattern steering

The "Angular Spatial Light Modulator" (ASLM) utilizes digital micromirror device (DMD) as a binary patterned programmable blazed grating to increase number of output pixels of a DMD by merging geometric and diffractive optical capabilities of the DMD. We demonstrate series of capabilities of the ASLM for beam and pattern steering. In particular, a single-chip beam steering lidar, an extended FOV display, a light-field projector, and a multi-view display which can be implemented into AR/VR systems. We also present our metrology results of wavefront distortion of DMD while micro mirrors are transitioning over between on and off states.Immediate accessThis item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at [email protected]

MEMS-based Angular and Spatial Light Modulation for Lidar and AR Displays

High-speed, monolithic and MEMS-based lidar and a large pixel count micro display device for AR display optics leverages a Digital Micromirror Device with a pulsed illumination that simultaneous modulates light in space and angular domain.12 month embargo; published 17 September 2020This item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at [email protected]